Accuracy of the g-force gauges

[first-gt]

I just picked up a slightly used 2019 GT. Everything checked out at an independent inspection and I've been loving the car so far. But I noticed some interesting numbers on the g-force gauges. The previously recorded brake force was up at 1.86. And the left lateral Gs were at 1.79. Are these numbers possible without being in an accident?

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[JGonvardi]

It’s easy to hit those numbers during spirited driving.

 

[gixxersixxerman]

There was a thread about this. You won’t see over 1.5 after it’s been reset. In fact a huge group called a few of us lairs that had seen anything over that 1.5. I like you 1.86 on brake and 1.79 on left. When they did my tsb and did some calibration it came back. Has something to do with some calibration. Seems once you reset it, you’ll never get over 1.5 actual

 

[Norm Peterson]

It’s easy to hit those numbers during spirited driving.

Those numbers are well beyond the realm of "spirited driving". Two people getting identical max readings like that is suspicious, like those readings might be what the display defaults to when the acceleration data is outside the expected range (whatever that might be).

1.5g should be high enough to pick up even peak-g readings from street tires, certainly any peaks attained in street driving. Beyond what the OE 20" Pirelli P-Zero summer tires can muster, and well beyond what the OE 18" and 19" Pirelli all-season tires are capable of.


Norm

 

[tokuzumi]

I could see an extreme braking event causing some decent G forces. But what I can't see happening is a lateral movement generating 2x the G force numbers generated by all auto reviewers. Unless it's some sort of initial jolt when doing a hard turn, but quickly levels out to what we would expect the levels to be?

 

[AlbertD]

I typically see around 1.2-1.3 lateral g on a race track with NT01s. I have a hard time believing someone can hit 1.7+ on the street from spirited driving. I would either suspect the calibration to be off or the car got whipped hard in a loss of control type situation.

 

[GregP27]

1.2 to 1.3? The auto magazines don't see those kinds of numbers on a street car with ANY street-legal tires. Even for a Porsche, Ferrari, etc.

 

[AlbertD]

1.2 to 1.3? The auto magazines don't see those kinds of numbers on a street car with ANY street-legal tires. Even for a Porsche, Ferrari, etc.

If you are referring to my post, the 1.2-1.3 range is easily attained with a properly setup car, experienced driver and sticky tires. The NT01s are 100 threadwear so not the typical "street" tire.

 

[Norm Peterson]

1.2 to 1.3? The auto magazines don't see those kinds of numbers on a street car with ANY street-legal tires. Even for a Porsche, Ferrari, etc.

I agree with Albert. Just a few tweaks that the car rags don't get to do can make the difference. Things like adding a little roll resistance and making more cornering-friendly camber settings, maybe wider tires on wider wheels, for starters.

Once sufficiently warmed up (and not overheated) even MPSS tires can be part of what puts a car into the 1.3x range (peak).

You may have to click to get the full size .jpg so you can read the table at the top left (1.28g peak left, 1.36g peak right peaks, 1.07g sustained left).

Norm

 

[NightmareMoon]

I've rarely seen higher than about 1.25 on my car at any track. "200TW" 305 RE71R w/ suspension mods, various parking lots and Texas tracks including CotA. For braking, I don't think I've even seen greater than 1.15g personally, even with the above tires and track pads (something something aggressive camber intended for cornering).

I have seen 1.50 a few times, but obviously that was an error which maxed out the software limit.

I wouldn't worry about anything greater than 1.7, its very likely in error (or the car was crashed).

 

[JGonvardi]

I disagree that these readings go beyond spirited driving. Some mountain passes will produce much higher readings than track sessions for me. 1.2 - 1.3 is well within what an s550 can handle on summer compound. The two identical max readings are interesting though.

 

[JGonvardi]

I usually run another G force meter and the one in track apps matches up to 1.5 G. It takes alot to overwhelm the grip on the PS4S

 

[Decanes]

I usually run another G force meter and the one in track apps matches up to 1.5 G. It takes alot to overwhelm the grip on the PS4S

I was looking for a post with the g-force meter in it because I was not sure if mine was correct or not lol
I just boke 1K miles on mine and was playing on country road and was very surprised what my results turned out to be. so reading your post I think it is correct

 

[gixxersixxerman]

I was looking for a post with the g-force meter in it because I was not sure if mine was correct or not lol
I just boke 1K miles on mine and was playing on country road and was very surprised what my results turned out to be. so reading your post I think it is correct

The 1.86 and 1.79 are from a calibration they do. Once reset you won’t see over 1.5. If you see 1.86 legitimately on the street it’s because you hit something. And same for the 1.79 you are not hitting these numbers from the OEM tires... no where close.

 

[GTP]

I am BSME and I think I recall that 1.0g is the theoretical limit without wing downforce?
Think about it. If the sideways force exceeds the gravitational force then the tires would lose grip and slip sideways. A lot.

But a winged car pushes down more than the car's weight. Which is why I REALLY want to drive a light winged car!!

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